Foams produced from a cosmetic agent, containing, in a cosmetically acceptable carriera) a polymer combination of at least one copolymer A, comprising (a1) at least one repetitive structural unit having at least one a silicone-containing side chain,(a2) at least one structural unit of formula (a2)where R3 represents a hydrogen atom or a methyl group and R4 represents a hydrogen atom or an equivalent of a cation, and (a3) at least one structural unit of formula (a3)where R1 represents a hydrogen atom or a methyl group and R2 represents a hydrogen atom, an equivalent of a cation, or a (C1-C4) alkyl group, and at least one copolymer B constituted of the monomers B1) n-butyl methacrylateB2) methacrylic acidB3) ethyl acrylateB4) ethyl methacrylateand optionally additional monomers, and b) at least one propellant, and c) water,are especially suitable for increasing the volume of keratinous fibers.
